Circuits designed by David Johnson, P.E.
Last Updated on: Friday, December 29, 2017 02:53 AM


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CMOS Schmitt Trigger IC Makes VCO

Energy Harvesting using a Current Transformer

Full Wave Rectifier

Ideal Blocking Diode Circuit for Photovoltaic Solar Panels

Low Power AC to DC Power Supply

Minature 24VAC Isolated +5V Supply

Miniature AC to DC Power Supply

Miniature Isolated AC/DC Power Supply

Miniature Isolated AC/DC Power Supply

Nine-Volt Battery Eliminator

Non-Isolated Off-Line AC to DC Power Supply

Off-Line Miniature Isolated AC/DC Power Supply

On/Off Flip/Flop Circuit with Automatic Timeout

Power Supply-24 Volts AC to 24 Volts DC

Precision Fullwave Rectifier

Reduce voltage to Photovoltaic Solar Panel with Ideal Diode

Very Loud Pulsating Beeper

Well Pump Flasher & Beeper

White LEDs powered by 24V

10mhz to 20mhz Laser Light Detector 

12kv Power Supply

12v Cooling Fan Thermostat

18v AC to DC Power Supply

240VAC to 5VDC Power Supply

4-20ma Current Loop Tester

9v Battery Eliminator

Battery Eliminator

Caps Provide Voltage Boost to Series Regulator

Charge Coupled MOSFET Relay #2

Circuit Protects from Battery Polarity Reversal

Classic Plus & Minus DC Power Supply